Semiconductor package assembly and method for forming the same

ABSTRACT

A semiconductor package assembly and method for forming the same are provided. The semiconductor package assembly includes a first semiconductor die and a second semiconductor die disposed on a first surface of a substrate. The first semiconductor die includes a peripheral region having a second edge facing the first edge of the second semiconductor die and a third edge opposite to the second edge, a circuit region surrounded by the peripheral region, wherein the circuit region has a fourth edge adjacent to the second edge and a fifth edge adjacent to the third edge. A minimum distance between the second edge and the fourth edge is a first distance, a minimum distance between the third edge and the fifth edge is a second distance, and the first distance is different from the second distance.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation application of pending U.S. application Ser. No. 16/043,326, filed on Jul. 24, 2018, which claims the benefit of U.S. Provisional Application No. 62/541,199 filed on Aug. 4, 2017 and U.S. Provisional Application No. 62/549,015 filed on Aug. 23, 2017, the entirety of which are incorporated by reference herein.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a semiconductor package assembly, and in particular to a semiconductor package assembly with horizontally discrete semiconductor dies and memory dies.

Description of the Related Art

A semiconductor package assembly can not only provide a semiconductor die with protection from environmental contaminants, but it can also provide an electrical connection between the semiconductor die packaged therein and a substrate, such as a printed circuit board (PCB). For instance, a semiconductor die may be enclosed in an encapsulating material, and traces are electrically connected to the semiconductor die and the substrate.

In high-level packaging technology, a memory die can be horizontally packaged with a semiconductor die in the semiconductor package assembly, and the semiconductor package assembly can provide an electrical connection between the semiconductor die and the memory die. However, a problem with such a semiconductor package assembly is that there are so many different sizes of memory dies on the market. It is necessary to design different layouts for semiconductor package assemblies using memory dies of different sizes, and this can lead to the rising cost of manufacturing these semiconductor package assemblies.

Therefore, a novel semiconductor package assembly and methods for forming the same are desirable.

BRIEF SUMMARY OF THE INVENTION

Semiconductor package assemblies are provided. An exemplary embodiment of a semiconductor package assembly includes a first semiconductor die and a second semiconductor die disposed on a first surface of a substrate, wherein the second semiconductor die comprises a first edge facing the first semiconductor die, and the first semiconductor die comprises: a peripheral region having a second edge facing the first edge of the second semiconductor die and a third edge opposite to the second edge; and a circuit region surrounded by the peripheral region, wherein the circuit region has a fourth edge adjacent to the second edge and a fifth edge adjacent to the third edge, and wherein a minimum distance between the second edge and the fourth edge is a first distance, a minimum distance between the third edge and the fifth edge is a second distance, and the first distance is different from the second distance. a semiconductor die and a first memory die disposed on a first surface of a substrate, wherein the first memory die comprises a first edge facing the semiconductor die.

Another exemplary embodiment of a semiconductor package assembly includes a first semiconductor die and a second semiconductor die disposed on a first surface of an interposer, wherein the first semiconductor die comprises: a peripheral region having a first edge facing the second semiconductor die and a second edge opposite to the first edge; and a circuit region surrounded by the peripheral region, wherein the circuit region has a third edge adjacent to the second semiconductor die and a fourth edge opposite to the third edge, wherein a first distance between the first edge and the third edge is different from a second distance between the second edge and the fourth edge, and wherein a third distance between the first edge and the second edge is greater than a fourth distance between the third edge and the fourth edge.

An exemplary embodiment of a method for forming a semiconductor package assembly includes performing a dicing process along a first scribe line of a wafer to separate a first circuit region from a second circuit region, wherein the first circuit region has a first edge adjacent to a second edge of the second circuit region, and a first distance between the first edge and the first scribe line is different from a second distance between the second edge and the first scribe line; forming a first semiconductor die having the first circuit region after performing the dicing process; and bonding the first semiconductor die and a second semiconductor die to a first surface of a substrate.

A detailed description is given in the following embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 is a cross-sectional view of a semiconductor package assembly, in accordance with some embodiments of the disclosure;

FIG. 2 is a top view of a wafer showing a method for forming semiconductor dies, in accordance with some embodiments of the disclosure;

FIG. 3A is a top view of a comparative semiconductor package assembly;

FIG. 3B is a top view of a semiconductor package assembly, in accordance with some embodiments of the disclosure, and FIG. 1 is a cross-sectional view of the semiconductor package assembly along line 1-1′ of FIG. 3B;

FIG. 3C is a top view of a semiconductor package assembly, in accordance with some other embodiments of the disclosure;

FIG. 4A is a top view of a comparative semiconductor package assembly;

FIG. 4B is a top view of a semiconductor package assembly, in accordance with some embodiments of the disclosure;

FIG. 4C is a top view of a semiconductor package assembly, in accordance with some other embodiments of the disclosure;

FIG. 5 is a top view of a wafer showing a method for forming semiconductor dies, in accordance with some other embodiments of the disclosure;

FIG. 6A is a top view of a semiconductor package assembly, in accordance with some embodiments of the disclosure; and

FIG. 6B is a top view of a semiconductor package assembly, in accordance with some other embodiments of the disclosure.

DETAILED DESCRIPTION OF THE INVENTION

The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is determined by reference to the appended claims.

The present invention will be described with respect to particular embodiments and with reference to certain drawings, but the invention is not limited thereto and is only limited by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some of the elements may be exaggerated for illustrative purposes and not drawn to scale. The dimensions and the relative dimensions do not correspond to actual dimensions in the practice of the invention.

FIG. 1 is a cross-sectional view of a semiconductor package assembly 100 b, in accordance with some embodiments of the disclosure. Additional features can be added to the semiconductor package structure 100 b. Some of the features described below can be replaced or eliminated for different embodiments. To simplify the diagram, only a portion of the semiconductor package assembly 100 b is depicted in FIG. 1. In some embodiments, the semiconductor package assembly 100 b may include a wafer-level semiconductor package, for example, a flip-chip semiconductor package.

Referring to FIG. 1, the semiconductor package assembly 100 b includes a base 107. The base 107 may be a printed circuit board (PCB) and may be formed of polypropylene (PP). It should also be noted that the base 107 can be a single layer or a multilayer structure, and the base 107 may include a redistribution layer (RDL) structure 105 therein. The base 107 has a first surface 107 a and a second surface 107 b opposite thereto. A plurality of conductive pads 109 is disposed on the first surface 107 a, and a plurality of conductive pads 103 is disposed on the second surface 107 b. In some embodiments, the conductive pads 103 and the conductive pads 109 may be conductive traces, and the conductive traces may comprise power segments, signal trace segments or ground trace segments, which are used for the input/output (I/O) connections of the semiconductor package assembly 100 b.

Moreover, the semiconductor package assembly 100 b includes a plurality of conductive structures 111 bonded onto the first surface 107 a and a plurality of conductive structures 101 bonded onto the second surface 107 b of the base 107. The conductive pads 103 are disposed between the conductive structures 101 and the base 107, and the conductive pads 109 are disposed between the conductive structures 111 and the base 107. In some embodiments, the conductive structures 101 may be conductive ball structures, such as ball grid array (BGA), conductive pillar structures, or conductive paste structures, and the conductive structures 111 may be controlled collapse chip connection (C4) structures.

As shown in FIG. 1, the semiconductor package assembly 100 b includes a substrate 121. The substrate 121 has a first surface 121 a and a second surface 121 b opposite thereto, and the semiconductor package assembly 100 b also includes a plurality of conductive vias 119 penetrating from the first surface 121 a to the second surface 121 b of the substrate 121. In some embodiments, the substrate 121 may be an interposer, and the conductive vias 119 may be through interposer vias (TIVs).

However, embodiments of the disclosure are not limited thereto. In some other embodiments, the substrate 121 may have a wiring structure therein. For example, the wiring structure in the substrate 121 may be a fan-out structure, and may include one or more conductive pads, conductive vias, conductive layers and conductive pillars. In such cases, the wiring structure in the substrate 121 may be disposed in one or more inter-metal dielectric (IMD) layers. In some embodiments, the IMD layers may be formed of organic materials, which include a polymer base material, non-organic materials, which include silicon nitride (SiN_(x)), silicon oxide (SiO_(x)), grapheme, or the like. For example, the IMD layers are made of a polymer base material. It should be noted that the number and configuration of the IMD layers, the conductive pads, the conductive vias, the conductive layers and the conductive pillars shown in Figures are only some examples and are not limitations to the present disclosure.

In addition, a passivation layer 115 is disposed on the second surface 121 b of the substrate 121, and the passivation layer 115 is penetrated by the conductive vias 119. In some embodiments, a plurality of under-bump metallurgy (UBM) layers 113 is interposed between the conductive structures 111 are the passivation layer 115. The substrate 121 is electrically connected to the base 107 through the UBM layers 113, the conductive structures 111 and the conductive pads 109. Each of the UBM layers 113 may include one or more layers, such as a barrier layer and a seed layer. The UBM layers 113 including a single layer are depicted herein as an example. Moreover, the conductive structures 111 are surrounded by an underfill layer 117 that is interposed between the first surface 107 a of the base 107 and the passivation layer 115.

Still referring to FIG. 1, the semiconductor package assembly 100 b includes a plurality of conductive pads 123 and a dielectric layer 125 disposed on the first surface 121 a of the substrate 121. In some embodiments, the dielectric layer 125 extends on the conductive pads 123, and a portion of the conductive pads 123 are exposed by the dielectric layer 125.

Moreover, the semiconductor package assembly 100 b also includes a semiconductor die 144 b and a memory die 150 b. The semiconductor die 144 b and the memory die 150 b are bonded to the first surface 121 a of the substrate 121 through a plurality of conductive structures 127. In some embodiments, the semiconductor die 144 b may be a system-on-chip (SOC), such as a logic die including a central processing unit (CPU), a graphics processing unit (GPU) or any combination thereof. In some embodiments, the memory die 150 b may be a hybrid dynamic random access memory (DRAM) die, such as a high bandwidth memory (HBM) die.

In some embodiments, both the semiconductor die 144 b and the memory die 150 b have a plurality of conductive pads 133 and a dielectric layer 131 thereon, the dielectric layer 131 extends on the conductive pads 133, and a portion of the conductive pads 133 is exposed by the dielectric layer 131. The semiconductor die 144 b and the memory die 150 b are electrically connected to the substrate 121 through the conductive pads 133, the conductive structures 127 and the conductive pads 123. In some embodiments, the conductive structures 127 are surrounded by an underfill layer 129, and the underfill layer 129 is interposed between the semiconductor die 144 b, the memory die 150 b and the dielectric layer 125 on the first surface 121 a of the substrate 121.

It should be noted that the semiconductor die 144 b and the memory die 150 b are separated by a portion of the underfill layer 129, and the semiconductor die 144 b and the memory die 150 b have a distance D1 between them. Moreover, a molding compound 135 is disposed on the dielectric layer 125. The underfill layer 129, the semiconductor die 144 b and the memory die 150 b are surrounded by the molding compound 135. That is, as shown in FIG. 1, the edges of the semiconductor die 144 b and the memory die 150 b away from each other are covered by the molding compound 135. The top surfaces of the semiconductor die 144 b and the memory die 150 b are coplanar with the top surfaces of the molding compound 135 and the underfill layer 129.

In some embodiments, the molding compound 135 may be formed of a nonconductive material, such as an epoxy, a resin, a moldable polymer, or the like. The molding compound 312 may be applied while substantially liquid, and then may be cured through a chemical reaction, such as in an epoxy or resin.

FIG. 2 is a top view of a wafer 200 showing a method for forming semiconductor dies, in accordance with some embodiments of the disclosure.

Since there are so many different sizes of memory dies on the market, it is necessary to design different layouts for semiconductor package assemblies using memory dies of different sizes, and this can lead to the rising cost of manufacturing these semiconductor package assemblies. In order to solve this problem, the dicing process performed on the wafer to form the semiconductor dies can be modified. Specifically, the locations of the scribe lines on the wafer can be adjusted, so that the dicing margins at opposite sides of each of the semiconductor dies (i.e. opposite sides of each of the circuit regions) are different.

As shown in FIG. 2, to simplify the diagram, only two adjacent circuit regions 1421 and 1422, and three scribe lines S1, S2 and S3 on the wafer 200 are depicted. The three scribe lines S1, S2 and S3 are parallel to each other. The scribe lines S1 and S2 are located at opposite sides of the circuit region 1421, the scribe lines S1 and S3 are located at opposite sides of the circuit region 1422, and the scribe line S1 is between the circuit regions 1421 and 1422.

In some embodiments, the scribe lines S1, S2 and S3 have the same width K. The circuit region 1421 has a first edge E1 adjacent to the scribe line S1, and the circuit region 1422 has a second edge E2 adjacent to the scribe line S1. A third edge E3 of the circuit region 1421 opposite to the first edge E1 is adjacent to the scribe line S2, and a fourth edge E4 of the circuit region 1422 opposite to the second edge E2 is adjacent to the scribe line S3.

It should be noted that the first edge E1 and the scribe line S1 have a distance D2 between them, the second edge E2 and the scribe line S1 have a distance D3 between them, and the distance D2 is different from the distance D3. Moreover, the third edge E3 and the scribe line S2 have the distance D3 between them, and the fourth edge E4 and the scribe line S3 have the distance D2 between them.

The region between the first edge E1 and the scribe line S1, and the region between the third edge E3 and the scribe line S2 are the dicing margins of the subsequently formed semiconductor die having the circuit region 1421. The region between the second edge E2 and the scribe line S1, and the region between the fourth edge E4 and the scribe line S3 are the dicing margins of the subsequently formed semiconductor die having the circuit region 1422.

After performing the dicing process, the circuit region 1421 is separated from the circuit region 1422. The circuit region 1421 and the peripheral region of the wafer 200 surrounding the circuit region 1421 (i.e. the dicing margin) constitute a semiconductor die, and the circuit region 1422 and the peripheral region of the wafer 200 surrounding the circuit region 1422 (i.e. the dicing margin) constitute another semiconductor die. In some embodiments, the peripheral regions have no circuit therein, they are dicing margins for forming the semiconductor dies.

The semiconductor die with the circuit region 1421 and the semiconductor die with the circuit region 1422 may be horizontally packaged with the memory die 150 b as shown in FIG. 1. That is, the semiconductor die with the circuit region 1421 and the semiconductor die with the circuit region 1422 may be similar to, or the same as, the semiconductor die 144 b of FIG. 1. It should be noted that the circuit regions 1421 and 1422 are completely surrounded by the peripheral regions, and the outer edge of the peripheral region is the physical edge of the semiconductor die, which is covered by the molding compound 135.

FIG. 3A is a top view of a comparative semiconductor package assembly 100 a. FIG. 3B is a top view of the semiconductor package assembly 100 b, in accordance with some embodiments of the disclosure, and FIG. 1 is a cross-sectional view of the semiconductor package assembly 100 b along line 1-1′ of FIG. 3B. FIG. 3C is a top view of a semiconductor package assembly 100 c, in accordance with some other embodiments of the disclosure. In order to simplify the diagram, only a semiconductor die and two memory dies on the substrate 121 are depicted in each of the FIGS. 3A, 3B and 3C.

As shown in FIG. 3A, the comparative semiconductor package assembly 100 a includes two memory dies 150 a and a semiconductor die 144 a disposed on the substrate 121. The memory dies 150 a, the semiconductor die 144 a and the substrate 121 are similar to, or the same as, the memory die 150 b, the semiconductor die 144 b and the substrate 121 previously described with reference to FIG. 1, and are not repeated for brevity. In addition, the two memory dies 150 a have the same width W3.

The semiconductor die 144 a is composed of a circuit region 142 and a peripheral region 140 a surrounding the circuit region 142. The two memory dies 150 a have edges 151 a and 152 a respectively. The semiconductor die 144 a has an edge 145 a facing the edges 151 a and 152 a of the memory dies 150 a and an edge 146 a opposite to the edge 145 a. The edge 145 a and the edge 146 a of the semiconductor die 144 a are physical edges, and they are also parts of the outer edge of the peripheral region 140 a.

Moreover, the circuit region 142 has an edge 147 a adjacent to the edge 145 a and an edge 148 a opposite to the edge 147 a. The edge 148 a of the circuit region 142 is adjacent to the edge 146 a of the peripheral region 140 a. In other words, the edges 147 a and 148 a are the parts of the interfaces between the circuit region 142 and the peripheral region 140 a. The edge 145 a and the edge 146 a have a distance between them, which is defined as a width W1 of the semiconductor die 144 a. The edge 147 a and the edge 148 a have a distance between them, which is defined as a width W2 of the circuit region 142. The width W1 is greater than the width W2, and the location of the width W2 is fully covered by that of the width W1.

In this embodiments, the distance D1 is between the edge 151 a of the memory die 150 a and the edge 145 a of the semiconductor die 144 a, which is the same as that shown in FIG. 1. It should be noted that the edge 145 a and the edge 147 a have a distance D2 a between them, the edge 146 a and the edge 148 a have a distance D3 a between them, and the distance D2 a is the same as the distance D3 a, since the dicing process for forming the semiconductor die 144 a is not adjusted as that shown in FIG. 2. That is, the peripheral region 142 is located at the center of the semiconductor die 144 a.

However, if the size of the memory dies 150 a are changed, the layout of the semiconductor package assembly 100 a will need to be changed accordingly, which leads to the rising costs of manufacturing the semiconductor package assembly 100 a.

In order to solve the aforementioned problem, a semiconductor die 144 b formed by the dicing process as shown in FIG. 2 is provided. Referring to FIG. 3B, two memory dies 150 b, which have size smaller than that of the memory dies 150 a of FIG. 3A, and a semiconductor die 144 b are disposed on the substrate 121 of the semiconductor package assembly 100 b.

Specifically, the two memory dies 150 b have the same width W4, and the width W4 is smaller than the width W3 of FIG. 3A. The two memory dies 150 b have edges 151 b and 152 b respectively. The semiconductor die 144 b has an edge 145 b facing the edges 151 b and 152 b of the memory dies 150 b and an edge 146 b opposite to the edge 145 b. The distance D1 between the edge 151 b and the edge 145 b of the peripheral region 140 b is the same as the distance D1 between the edge 152 b and the edge 145 b of the peripheral region 140 b.

In this embodiment, in order to reduce warpage and to prevent reliability problems with the semiconductor package assembly, the distance D1 between the memory dies 150 b and the semiconductor die 144 b needs to be the same as the distance D1 between the memory dies 150 a and the semiconductor die 144 a in FIG. 3A.

Moreover, the circuit region 142 has an edge 147 b adjacent to the edge 145 b and an edge 148 b opposite to the edge 147 b. The edge 148 b of the circuit region 142 is adjacent to the edge 146 b of the peripheral region 140 b. In other words, the edges 147 b and 148 b are the parts of the interfaces between the circuit region 142 and the peripheral region 140 b.

The edge 145 b and the edge 146 b have a distance between them, which is defined as a width W1 of the semiconductor die 144 b. The edge 147 b and the edge 148 b have a distance between them, which is defined as a width W2 of the circuit region 142. The width W1 is greater than the width W2, and the location of the width W2 is fully covered by that of the width W1. The width W1 of FIG. 3B is the same as the width W1 of FIG. 3A, and the width W2 is the same as the width W2 of FIG. 3B. However, the location of the circuit region 142 of FIG. 3B is different from that of the circuit region 142 of FIG. 3A.

Still referring to FIG. 3B, the edge 145 b and the edge 147 b have a distance D2 b between them, the edge 146 b and the edge 148 b have a distance D3 b between them. In order to use the same layout as the semiconductor package assembly 100 a in FIG. 3A, the distance D2 b between the edge 145 b and the edge 147 b is greater than the distance D3 b between the edge 146 b and the edge 148 b. It should be noted that the semiconductor die 144 b is formed by the dicing process in FIG. 2. Therefore, the dicing margins at opposite sides of the circuit region 142 are different. In other words, the circuit region 142 is not located at the center of the semiconductor die 144 b.

To sum up, the memory dies 150 b have the width W4 smaller than the width W3 of the memory dies 150 a, the larger distance D2 b between the physical edge 145 b of the semiconductor die 144 b and the edge 147 b of the circuit region 142 is set to be closer to the memory dies 150 b than the smaller distance D3 b between the edge 146 b of the semiconductor die 144 b and the edge 148 b of the circuit region 142. As a result, the layout of the semiconductor package assembly 100 b may be in the same position of the layout of the semiconductor package assembly 100 a.

In some other embodiments, as shown in FIG. 3C, two memory dies 150 c, which have size greater than that of the memory dies 150 a of FIG. 3A are provided. The electrical connection between the memory dies 150 c, the semiconductor die 144 c and the substrate 121 are similar to, or the same as, that of the memory dies 150 b, the semiconductor die 144 b and the substrate 121 previously described with reference to FIG. 1, and are not repeated for brevity.

Specifically, the two memory dies 150 c have the same width W5, and the width W5 is greater than the width W3 of FIG. 3A. The two memory dies 150 c have edges 151 c and 152 c respectively. The semiconductor die 144 c has an edge 145 c facing the edges 151 c and 152 c of the memory dies 150 c and an edge 146 c opposite to the edge 145 c. The distance D1 between the edge 151 c and the edge 145 c of the peripheral region 140 c is the same as the distance D1 between the edge 152 c and the edge 145 c of the peripheral region 140 c.

In this embodiment, in order to reduce warpage and to prevent reliability problems with the semiconductor package assembly, the distance D1 between the memory dies 150 c and the semiconductor die 144 c needs to be the same as the distance D1 between the memory dies 150 a and the semiconductor die 144 a in FIG. 3A.

As indicated above, in order to use the same layout as the semiconductor package assembly 100 a in FIG. 3A, the distance D2 c between the edge 145 c and the edge 147 c is smaller than the distance D3 c between the edge 146 c and the edge 148 c. It should be noted that the semiconductor die 144 c is formed by the dicing process illustrated in FIG. 2. Therefore, the dicing margins at opposite sides of the circuit region 142 are different. In other words, the circuit region 142 is not located at the center of the semiconductor die 144 c.

To sum up, the memory dies 150 c have a width W5 that is greater than the width W3 of memory dies 150 a, the smaller distance D2 c between the physical edge 145 c of the semiconductor die 144 c and the edge 147 c of the circuit region 142 is set to be closer to the memory dies 150 c than the greater distance D3 c between the edge 146 c of the semiconductor die 144 c and the edge 148 c of the circuit region 142. As a result, the layout of the semiconductor package assembly 100 c may be in the same position of the layout of the semiconductor package assembly 100 a.

FIG. 4A is a top view of the comparative semiconductor package assembly 100 a. FIG. 4B is a top view of the semiconductor package assembly 100 b, in accordance with some embodiments of the disclosure. FIG. 4C is a top view of the semiconductor package assembly 100 c, in accordance with some other embodiments of the disclosure. FIGS. 4A, 4B and 4C are similar to FIGS. 3A, 3B and 3C. The difference between FIGS. 4A-4C and FIGS. 3A-3C is that a plurality of conductive wires 160 a, 160 b and 160 c are illustrated in FIGS. 4A-4C.

As shown in FIG. 4A, the conductive wires 160 a are disposed on the semiconductor die 144 a and the memory dies 150 a, and the memory dies 150 a are electrically connected to the semiconductor die 144 a through the conductive wires 160 a.

The six conductive wires 160 a have the same length L. The length L1 a is the length of the portions of the conductive wires 160 a overlap the memory dies 150 a, and the length L2 is the length of the portions of the conductive wires 160 a overlap the circuit region 142 of the semiconductor die 144 a. The conductive wires 160 a extend across the edge 151 a of the memory die 150 a, the edge 145 a of the peripheral region 140 a and the edge 147 a of the circuit region 142.

As shown in FIG. 4B, similar to the semiconductor package assembly 100 a, the semiconductor package assembly 100 b includes conductive wires 160 b disposed on the semiconductor die 144 b and the memory dies 150 b, and the memory dies 150 b are electrically connected to the semiconductor die 144 b through the conductive wires 160 b. Although FIG. 4B shows only six conductive wires 160 b, it should be noted that there is no limitation on the number of the conductive wires 160 b on the memory dies 150 b and the semiconductor die 144 b.

The six conductive wires 160 b have the same length L. The length L1 b is the length of the portions of the conductive wires 160 b overlap the memory dies 150 b, and the length L2 is the length of the portions of the conductive wires 160 b overlap the circuit region 142 of the semiconductor die 144 b. The conductive wires 160 b extend across the edge 151 b of the memory die 150 b, the edge 145 b of the peripheral region 140 b and the edge 147 b of the circuit region 142.

Compared with the semiconductor package assembly 100 a, the length L of the conductive wires 160 b is the same as that of the conductive wires 160 a, and the length L2 of the portions of the conductive wires 160 b overlap the circuit region 142 of the semiconductor die 144 b is the same as that of the conductive wires 160 a shown in FIG. 4A.

It should be noted that the size of the memory dies 150 b is smaller than the size of the memory dies 150 a, and the center of each of the memory dies 150 b is at the same positions as the center of each of the memory dies 150 a. Therefore, the length L1 b of the portions of the conductive wires 160 b that overlap the memory dies 150 b is shorter than the length L1 a of the portions of the conductive wires 160 a that overlap the memory dies 150 a.

As shown in FIG. 4C, similar to the semiconductor package assembly 100 a, the semiconductor package assembly 100 c includes conductive wires 160 c disposed on the semiconductor die 144 c and the memory dies 150 c, and the memory dies 150 c are electrically connected to the semiconductor die 144 c through the conductive wires 160 c.

The six conductive wires 160 c have the same length L. The length L1 c is the length of the portions of the conductive wires 160 c that overlap the memory dies 150 c, and the length L2 is the length of the portions of the conductive wires 160 c overlap the circuit region 142 of the semiconductor die 144 c. The conductive wires 160 c extend across the edge 151 c of the memory die 150 c, the edge 145 c of the peripheral region 140 c and the edge 147 c of the circuit region 142.

Compared with the semiconductor package assembly 100 a, the length L of the conductive wires 160 c is the same as that of the conductive wires 160 a, and the length L2 of the portions of the conductive wires 160 c that overlap the circuit region 142 of the semiconductor die 144 c is the same as that of the conductive wires 160 c shown in FIG. 4A.

It should be noted that the size of the memory dies 150 c is greater than the size of the memory dies 150 c, and the centers of each of the memory dies 150 c are at the same positions as that of the centers of each of the memory dies 150 a. Therefore, the length L1 c of the portions of the conductive wires 160 c overlap the memory dies 150 c is greater than the length L1 a of the portions of the conductive wires 160 a overlap the memory dies 150 a.

Moreover, although the sizes of the memory dies 150 a, 150 b and 150 c are different from each other, the solder joints of the memory dies 150 a, 150 b and 150 c, which are used to output signals, are located at the same positions. Therefore, the conductive wires 160 b and 160 c may have the same length L as that of the conductive wires 160 a, and the signal performance will not decrease while using memory dies 150 b and 150 c having different sizes from that of the memory dies 150 a.

FIG. 5 is a top view of a wafer 300 showing a method for forming semiconductor dies, in accordance with some other embodiments of the disclosure. As shown in FIG. 5, the wafer 300 has two circuit regions 1421 and 1422, the circuit region 1421 has an edge E1 facing an edge E2 of the circuit region 1422.

The difference between the wafer 200 of FIG. 2 and the wafer 300 of FIG. 3 is that there are two scribe lines S1 and S2 between two adjacent circuit regions 1421 and 1422. Compared with the wafer 200, since there are more scribe lines between the two adjacent circuit regions 1421 and 1422, the distance D4 between the edge E1 and the scribe line S1 and the distance D5 between the edge E2 and the scribe line S2 can be adjusted more flexibly. In some embodiments, the distance D4 may be the same as the distance D5. In some other embodiments, the distance D4 may be different from the distance D5. The distance D4 and D5 may be adjusted according to the sizes of the memory dies which will be packaged with the semiconductor dies with the circuit regions 1421 and 1422 in the following process.

FIG. 6A is a top view of a semiconductor package assembly 100 d, in accordance with some embodiments of the disclosure. FIG. 6B is a top view of a semiconductor package assembly 100 e, in accordance with some other embodiments of the disclosure.

As shown in FIG. 6A, there are four memory dies 150 b and a semiconductor die 144 d disposed on the substrate 121. The four memory dies 150 b have the same width W4, which is the same as that of the memory dies 150 b of FIG. 3B and smaller than the width W3 of the memory dies 150 a of FIG. 3A. Compared with the semiconductor package assembly 100 b in FIG. 3B, the semiconductor package assembly 100 d further includes two memory dies 150 b disposed adjacent to the edge 146 d of the peripheral region 140 d. That is, the memory dies 150 b are disposed at opposite sides of the semiconductor dies 144 d.

In this embodiment, the distance D1 between the edge 151 d of the memory die 150 b and the edge 145 d of the peripheral region 140 d is the same as the distance D1 between the edge 153 d of the memory die 150 b and the edge 146 d of the peripheral region 140 d. In addition, since the semiconductor die 144 d may be formed by the dicing process shown in FIG. 5, the distance D2 b between the edge 145 d of the peripheral region 140 d and the edge 147 d of the circuit region 142 may be the same as the distance D2 b between the edge 146 d of the peripheral region 140 d and the edge 148 d of the circuit region 142.

In other embodiments, if the memory dies 150 b disposed at opposite sides of the semiconductor die 144 d have different sizes, the distance D2 b between the edge 145 d and the edge 147 d may be different from the distance D2 b between the edge 146 d and the edge 148 d.

As shown in FIG. 6B, there are four memory dies 150 c and a semiconductor die 144 e disposed on the substrate 121. The four memory dies 150 c have the same width W5, which is the same as that of the memory dies 150 c of FIG. 3C and greater than the width W3 of the memory dies 150 a of FIG. 3A. Compared with the semiconductor package assembly 100 c in FIG. 3C, the semiconductor package assembly 100 e further includes two memory dies 150 c disposed adjacent to the edge 146 e of the peripheral region 140 e. That is, the memory dies 150 c are disposed at opposite sides of the semiconductor dies 144 e.

In this embodiment, the distance D1 between the edge 151 e of the memory dies 150 c and the edge 145 e of the peripheral region 140 e is the same as the distance D1 between the edge 153 e of the memory dies 150 c and the edge 146 e of the peripheral region 140 e. In addition, since the semiconductor die 144 e may be formed by the dicing process shown in FIG. 5, the distance D2 c between the edge 145 e of the peripheral region 140 e and the edge 147 e of the circuit region 142 may be the same as the distance D2 c between the edge 146 e of the peripheral region 140 e and the edge 148 e of the circuit region 142.

In other embodiments, if the memory dies 150 c disposed at opposite sides of the semiconductor die 144 e have different sizes, the distance D2 c between the edge 145 e and the edge 147 e may be different from the distance D2 c between the edge 146 e and the edge 148 e.

Since there are so many different sizes of memory dies on the market, it is necessary to design different layouts for semiconductor package assemblies using memory dies of different sizes, and this can lead to the rising cost of manufacturing these semiconductor package assemblies. According to the foregoing embodiments, the locations of the scribe lines on the wafer can be adjusted, such that the dicing margins at opposite sides of each of the semiconductor dies (i.e. opposite sides of each of the circuit regions) are different. As a result, the distances between the physical edges of the semiconductor die and the edges of the circuit region inside the semiconductor die are different at opposite sides of the circuit region. In other words, the peripheral region surrounding the circuit region has different widths at opposite sides of the circuit region, and the widths of the peripheral region may be adjusted according to the sizes of the memory dies which will be packaged with the semiconductor die in the following process.

Many variations and/or modifications can be made to embodiments of the disclosure. The semiconductor package structures in accordance with some embodiments of the disclosure can be used to form a three-dimensional (3D) package, a 2.5D package, a fan-out package, or another suitable package.

While the invention has been described by way of example and in terms of the preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements. 

What is claimed is:
 1. A semiconductor package assembly, comprising: a first semiconductor die and a second semiconductor die disposed on a first surface of a substrate, wherein the second semiconductor die comprises a first edge facing the first semiconductor die, and the first semiconductor die comprises: a peripheral region having a second edge facing the first edge of the second semiconductor die and a third edge opposite to the second edge; and a circuit region surrounded by the peripheral region, wherein the circuit region has a fourth edge adjacent to the second edge and a fifth edge adjacent to the third edge, and wherein a minimum distance between the second edge and the fourth edge is a first distance, a minimum distance between the third edge and the fifth edge is a second distance, and the first distance is different from the second distance.
 2. The semiconductor package assembly as claimed in claim 1, further comprising: a third semiconductor die disposed on the first surface of the substrate, wherein a width of the second semiconductor die is the same as a width of the third semiconductor die, and the second edge is between the fourth edge and a sixth edge of the third semiconductor die.
 3. The semiconductor package assembly as claimed in claim 2, wherein a minimum distance between the first edge and the second edge is the same as a minimum distance between the sixth edge and the second edge.
 4. The semiconductor package assembly as claimed in claim 1, wherein the peripheral region is a dicing margin for forming the first semiconductor die.
 5. The semiconductor package assembly as claimed in claim 1, further comprising: a plurality of conductive structures disposed on the substrate, wherein the first semiconductor die and the second semiconductor die are electrically connected to the substrate through the conductive structures.
 6. The semiconductor package assembly as claimed in claim 1, further comprising: a conductive wire disposed on the first semiconductor die and the second semiconductor die, wherein the second semiconductor die is electrically connected to the first semiconductor die through the conductive wire.
 7. The semiconductor package assembly as claimed in claim 6, wherein the conductive wire extends across the first edge, the second edge and the fourth edge.
 8. A semiconductor package assembly, comprising: a first semiconductor die and a second semiconductor die disposed on a first surface of an interposer, wherein the first semiconductor die comprises: a peripheral region having a first edge facing the second semiconductor die and a second edge opposite to the first edge; and a circuit region surrounded by the peripheral region, wherein the circuit region has a third edge adjacent to the second semiconductor die and a fourth edge opposite to the third edge, wherein a first distance between the first edge and the third edge is different from a second distance between the second edge and the fourth edge, and wherein a third distance between the first edge and the second edge is greater than a fourth distance between the third edge and the fourth edge.
 9. The semiconductor package assembly as claimed in claim 8, further comprising: a plurality of first conductive structures disposed on the interposer, wherein the first semiconductor die and the second semiconductor die are electrically connected to the interposer through the first conductive structures; and a first underfill layer interposed between the first surface of the interposer, the first semiconductor die and the second semiconductor die, wherein the first conductive structures are surrounded by the first underfill layer.
 10. The semiconductor package assembly as claimed in claim 9, wherein the first semiconductor die and the second semiconductor die are separated by a portion of the first underfill layer.
 11. The semiconductor package assembly as claimed in claim 10, further comprising: a molding compound surrounding the first underfill layer, the first semiconductor die and the second semiconductor die, wherein the second edge of the peripheral region of the first semiconductor die is covered by the molding compound.
 12. The semiconductor package assembly as claimed in claim 8, further comprising: a plurality of second conductive structures disposed on a second surface of the interposer, wherein the second surface is opposite to the first surface of the interposer.
 13. The semiconductor package assembly as claimed in claim 12, further comprising: a printed circuit board, wherein the second conductive structures are disposed between the printed circuit board and the interposer, and the printed circuit board is electrically connected to the interposer through the second conductive structures; and a second underfill layer interposed between the second surface of the interposer and the printed circuit board, wherein the second conductive structures are surrounded by the second underfill layer.
 14. A method for forming a semiconductor package assembly, comprising; performing a dicing process along a first scribe line of a wafer to separate a first circuit region from a second circuit region, wherein the first circuit region has a first edge adjacent to a second edge of the second circuit region, and a first distance between the first edge and the first scribe line is different from a second distance between the second edge and the first scribe line; forming a first semiconductor die having the first circuit region after performing the dicing process; and bonding the first semiconductor die and a second semiconductor die to a first surface of a substrate.
 15. The method as claimed in claim 14, wherein the formation of the first semiconductor die further comprises: dicing the wafer along a second scribe line, wherein the first scribe line and the second scribe line are located at opposite sides of the first circuit region.
 16. The method as claimed in claim 15, wherein the first circuit region has a third edge opposite to the first edge, and a third distance between the third edge and the second scribe line is different from the first distance.
 17. The method as claimed in claim 16, wherein the third distance is the same as the second distance.
 18. The method as claimed in claim 15, wherein the first scribe line has a width that is the same as that of the second scribe line.
 19. The method as claimed in claim 14, further comprising: bonding a third semiconductor die on the first surface of the substrate, wherein a minimum distance between the second semiconductor die and the first edge of the first circuit region is the same as a minimum distance between the third semiconductor die and the first edge of the first circuit region.
 20. The method as claimed in claim 19, further comprising: forming a first conductive wire on the first memory die and the first semiconductor die; and forming a second conductive wire on the third semiconductor die and the first semiconductor die, wherein the first conductive wire has a length that is the same as that of the second conductive wire. 